Pump



Feb. 10, 1953 H. w. KAATZ ETAL 2,627,816

PUMP

Filed April 1, 1949 2 SHEETSSHEET l ATTORNEY? Feb. 10, 1953 H. w. KAATZ ETAL 2,627,816

. PUMP Filed April 1, 1949 2 SHEETS-SHEET 2 JNVEN TOR.

HERBZERT W KAA T Z HAROLD E ENYEAET ATTORNE Y5 Patented Feb. 10, 1953 PUMP # Herbert W.- Kaatz and Harold F. Enyeart, f. e Elyria, Ohio wf. Application April 1,1948, Serial N o18 ,347

V. lclaims.

.zhmI'his-s-invention relates to pumps and more particularly to bilge and sump pumpsfand to r; the art of making pumps.

It is amongtheobjects of our invention to i'* -provide an electrically driven pump with the '-electric motor and the hydraulic pumping eler- ---mentsembraced in the samehousing wherewith the-whole-;may be entirely submerged under water-asirr the bottom of the bilge of a vessel and run for long periods of timeathigh efiiciency M/and withouttrouble or care.

lowheight and small mass whereby to fit con- --'l; veniently under. the floor or deckboardsof small ...v.-- vessels.x Another object is to provide such a pump and motor'assembly in which themotor parts" are hermetically sealed and permitted to \ewbreathe. A further object is to provide-acou- .struction and method wherewith both the driving motor-rand pump impeller may be correctly centered in alignment within the housing and wherewith-the, impeller .may be properly borne and disposed within the pump chamber and supported both axially and radially with-much accuracy on the motor: bearings wherewith to obviate outboard bearingsuniversal-joints orloose couplings between the motornandimpeller Another ob- 1 expensivemotors-may.be efiiciently and certainly r; given-aligning surf aces or .structures wherewith rtcrmatewwith corresponding centering surfaces the housing that embraces the-pump. toiacili- 1 tate'the desired alignmentand concentricity of 1 i all the-movingparts relative-to the housing'and more particularly to the surfaces of the pumping chamber of the housing. A further-object is to l-wprovide-a corrosion-proof-pump:.andzpump asu-sembly in connection with the non-corrosion- ;----proof 'parts of. a driving-motor. :"Aiurthe'r object is to provide -water-prootii connection for electrical leads-to the driving motor of a'motor :pumpa'ssembly-and to" providearfiame-proof and explosion proofconstruction for the motor=with respectto the atmosphere of thebilge on sump -in-'whichit;may:be putito uset Another 1 object issto provide for heat'dissipation from thed-riving z motorparticularlyto the 'waterucooled: parts of V. the" pump portion of the assemblywherewith to iacilitate fullload'operation for long periods of .time without injury or 'substantial loss of ef- 1 :ficiency due to. deleterious'increase Lin rtem-peratureof the driving motor *orLof thewhole a'ssem- I;

Another object is to provideaa pumping unit comprising motor and pump'in which the parts areclosely coupled and in which the whole of the instrumentality is of ject is ,totprovidezmethod and "means wherewith .wstandardrlightiweight, sheet metal encased in- 2 blyr AnotherFobject' isito' -provide' that the sevt eral constituent parts and particularly thepump partof theassembly-"be easily made to close and desirable-tolerances wherewith to achieve and -maintainhighoperating efliciencies and also to reduce the friction load particularly of thefluid seal between the pumping and driving parts thereof. Another="objectis to provide for the rapid and secure" assembly of the motor and =pump parts and-rapid.and eflicientclosing andsealing of the mhousing and particularly that'part from which -liquid-is to be excluded Another object is to provide simple, inexpensive and highly eflicient means for screening out debris and foreign matter-irorrr theinlet side of the pump and to providea substantially self-cleaning screening. An- .-otherobject is to provide a pump which will be effectiveto remove water from substantially the 20 Jultimatebottom-of the bilge or sump.

Anotherobjectof our invention is to provide amethod of making and assembling a-pump for carrying out some or all the preceding. objects and 'more-v particularly to provide a method of centering, locating and aligning the motor and impeller parts ofa pump withrespect to their respective working chambers and coacting parts, 'housings 1 and instrumentalities.

Other-objects include providing methodand -nieans. forumaking anefficient, compact,longi-lived,t rugged. bilgepump economically and effectively. -Other objects will-appear :from the following adescription of the preferred form of our invention reference: being had to the accompanying drawings-in which Figure 1 is a'longitudinal section taken on the brokenline 1-! of Figure 2; rFigure2 is a-transverse section taken along the in line 22 of Figure 1; Figure 3 isan end elevation no of the'motor: with the pilot ringattached and Figure 4 is a'fragmentary transverse section taken along the line 4-4 of Figure 1' suggesting the :detail ofthe 'bayonetlo'ckmechanism'and the cover ofthe housing.

the preferredform ofour invention, illustrated'in the accompanying drawing, the assembl'y of the "motor I andpump 2 is embraced or contain'edintia cylindrical housing 3, the'upper, "as" viewed in Figul; end "of' whichzis closed by a cover Athrough' which pass electrical leads 5, and the lower end of? which includes the partition 5 that'separates the motor-chambenl 'from the pump chamber 3. The extreme" lower end of the housing is" closed by a plate 9"havinga central aperture It which comprises the inlet to the pump. A screen i overlies the plate Ill, and the extreme bottom end of the housing comprises a flared outwardly and downwardly extending perforate flange or bell 82 on the lower edge of which the pump is adapted to rest in operative position; the perforations l3 comprising a strainer outwardly of the screen ll wherewith to exclude chips and debris from the screen. As shown in Figure 2 the housing 3 also comprises at a level just above the flange l2 the pump outlet port i l which preferably terminates in an internally threaded aperture for attachment to a discharge pipe or line.

As shown in Figures 1 and 2 the impeller it of the pump is secured to the extreme lower end of the motor shaft ll with the impeller vanes clearing the inward face of the plate 9 with a desirable close tolerance. The impeller comprises a disc portion 58 from which the vanes thereof preferably rise integrally and comprises a cylindrical body portion I9 which is internally tapped in about th plane of the disc I 8 for threaded engagement with the threaded end of the motor shaft ll and is drilled out internally for close sliding, guiding and centering fit with the smooth cylindrical portion of the motor shaft as at 29. Externally the body portion 19 has a smooth right cylindrical surface normal to the plane of the disc and extending through the central aperture E5 in the partition 6 with wide tolerance and having exterior sliding and sealing contact with the seal 2! which is carried in a stepped shoulder in the partition ii. The seal element 2! which per se is not part of our invention preferably comprises a rubber-like ring with a metallic back up ring 22, all of which has a tight pressed fit in the shouldered portion of the partition 6; the seal presenting a narrow wiping edge contact with the external smooth cylindrical surface of the body of the impeller in stressed, deformed and substantially line contact therewith. Pref erably the contacting edge of the seal has an idle diameter approximately ten to fifteen thousandths of an inch smaller than the external diameter of the body of the impeller which admits the assembly of the parts with little effort but maintains a liquid tight seal between the body of the impeller and the partition 6 wherewith to exclude liquid of the pump chamber 8 from entering the motor chamber 7 even though the pump be totally submerged in operation for long periods of time.

The peripheral portion of the impeller disc clears an annular smooth surface 23 with a desirable close free running clearance which is adiust- 1 ably determined by the position of the impeller on the motor shaft and is maintained by a dome nut 2 lying in the eye of the impeller and having threaded engagement with the extreme end of the motor shaft and locking the impeller at its desired and intended longitudinal position on the motor shaft.

The top cover plate 4 of the assembly is inserted into the open upper cylindrical end of the housing 3 and is preferably secured therein by a bayonet locking structure, see also Figure 4, as between lugs 3!! of limited peripheral length integrally formed with the cover and complementary lugs ii of limited peripheral length integrally formed with the housing. The cover 4 also has an annular groove 32 in which is preferably disposed an O ring seal 33 which makes fluid tight sealing contact with the oomplementarily disposed annular smooth internal cylindrical. surface of the housing 3. Assembly of the cover with the housing is quickly facilitated by axial insertion thereof as permitted by the bayonet lock and lugs and a fraction of a turn in the familiar fashion to effect the bayonet lock between the cover and the housing. Preferably the cover has a rad lily extending lug 34 which overlies the upper per ipherai edge of the housing and has a tapped hole for receiving the threaded portion of the locking screw 35, the smooth end of which enters the small drilled hole 36 in the wall of the housing to secure the cover and housing against rotation after the parts are assembled thereby maintaining the bayonet lock relation between them.

Preferably the upper and outer wall of the cover has a transverse aperture or eye 3'! through the lug 353 through which the whole pump assembly may be hooked or suspended for raising or lowering as for example when it is desired to suspend the pump over th side of a vessel to pumpwater for washing decks or otherwise as may be desired.

As mentioned above the cover is apertured to facilitate the entry of the electrical leads 5; the cover having an internally tapped boss 40 which threadably receives a gland or packing nut 4! which is adapted to force a rubber-like compression washer 2 into a stepped annular shouldered counterbore 33 adjacent the central aperture 44 through which the conduit 15 containing the electrical leads 5 extends. Preferably the conduit 45 is formed of fairly thick wall rubber tube having a close sliding fit with the aperture 44 and which upon compression of the sealing washer 43 is secured in fluid tight sealing relation to the cover 4 wherewith to exclude fluid from passing through the cover via the aperture i l to or from the motor chamber 7 of the housing. The conduit a5 is of circular contour internally and externally and is, of course, large enough internally to contain the electrical leads 5 with air space therebetween with the result that when the conduit is sealed as aforesaid in relation to the cover and aperture ti l there will be provided an internal air space and passage within the conduit 5 and among the electrical leads 5 to permit the motor chamber '1 to breathe through the conduit 4-5. To facilitate breathing the conduit 45 will, of course, be longer than the depth of the water or liquid in which the pump is submerged and will be open to atmosphere where the leads protrude from the upper end of the conduit. Preferably the conduit 45 will be at least two or three feet long even if the liquid level of the bilge be much less than the length of the conduit so that the breathing passage among the leads and through the conduit will be so long and restricted as to give explosion-proof characteristics to the motor of the pump.

The cover member 4 also perform the function of mounting and/or maintaining the motor 7 in its desired mounted centered and aligned relation to the housing and pump parts. To this end there is formed on the inside of the cover 4 an annular boss 50 defining a central cupped depression 5! in axial alignment with the axis of the motor and shaft thereof, which cup 5| is axially aligned with the aperture iii in the partition 6 at the opposite end of the housing. In the cup-like depression 5! i disposed a disc or like pad 53 of rubber or rubber-like material of thickness preferably substantially greater than the depth of the cup which upon forcible engagement with the rounded end 52 of the motor casing yleldingly admits the end of the motor cas- 6 oleior'fstatompieceseand/or: theaiframewibody or earingi parts of: the? :motom against: which the overing :cups arevintendedztozhave i'gid-lzand seicure rpiosition; and'xzbearina'i Thesg'ring; a 'Jthus securedorrtentativelyv secured: to theiendvface of the: cuplfifltii's largelydependent uponiits': frictional ontact :th'erewith' iors security lof 'ulocationzzwith ..re spect :to the 'aXis-of 17118511101701 tin partib'ecause of the conventional -practiceiiotrallowingtheystay bolts: .a. considerable :transverse-itolerance in repect to the: apertures in thecupsl'throughiwvhich hewpass. At this pointiof-lassemblya of thei ring The nrot'or' 'l which nra f take any: one'iof a with thezmotor itiwi ll :be"notedathat thecinner number or conventi'onal forms serves :to -illusrandaupward sharpaannu-lar corner 6810fthe-strin trate the-'principles andprecepts ofif-ouriinven- 1'5 1 has ani-cedg'e bearing on thei-protuberanceifil at tion 'wlien it takes' the form 50f an'i-inexpensive 1 east: where it has 'oonta'cted the same: :zGeneralcommercial typehaving a casing for med/of 'teley. *s'peakingthig:contacttendsztoa center :thei sring scoping deepdrawrf sheet metal cup /Strand 6| with-:zrespe'ct =tlth6 protuberancezwhiehiis' not which e ag thelmotbpa'nd aresec red' 'together 1 necessarily tru1y:.-;centered:. Zwitha respect :itdi the in telescoped relation bylongitudinallyextendaxis ;of; the motor. *A: next step :in ourxi'method mg: staybolts 63 'irr 'aconventionaland wellwhich .we havefoundparticularly advantageous known 'manne'r. In the particular fiormof morequires the provision of%drilled holes 69:2'pref tor; the useof which is illustrative 'of" ouriinvenerablyzinthetradiallyl'inward portiomof-th'e'f'rin ti the cup memb'er 6|" has: a 'centralf'i's'omen: the zone'of the .counterbore fifitithereofrwhich hat stepped double sphericalfiorm terrainatirig are preferably spaced:circumferentiallyvifrom the the spherical :s ur face fiz-whichyas' mentioned tapped holes 61. 22The'. holes fianreceivewsheet above; is'engaged by therubber-like-pa'd 53.:The ametal screws 1-0; see zalsoi'Figurer-s; which have cup mmhenw containing thelower partiof the athreaded engagement with the"meta1:of% thewbase -mot0rhas a similar end oonstructioniwith the of the cup adjacent the protuberarioe fifl andtprefsmaller and=secondary spherical: partr'apertured 3D:-%erab1y: slightly arad-iallyoutward-i :thereofgsf the tof admit the motor shaft IT. The/primary or 1' screws: entering:appropriately::prickedsholes in ilarger-somewhat spherical protuberan'e ii l" rises 'i the 'sheetimetali of the cupiat-placessselected so "from'th'e base of the cup member lsfl having its that'- thei'endsrof thescrewsz thattipenetrate' the annular 'cu'rvedAwall asubstaritially concentric 1 wa1l.:of the cupi will notncontactz'or:intenfereiwith with: the 'axis of the-motorzandthe axis of the i any-20f the parts of the motor containedatherein. shaft thereof but since the wholecup islmade of The:sheetcmetalescnews; howevemahavingeshanks V .r .a-n inexpensive drawing theconfiguratio'nbf this which :fit-zsnugly int thedrilledholes 69 as the protuberance is not necessarilyiconeentric 'with ring :a known: manner :makentheir: own-moles V in the-:tol'erances we id'esire toffemploy in mountin their sheet-metal cupsfix theitring rigidly and i'ng; and locating the motor within the housing positively vwithi r'espect to the cupzfiflgdrawing the it-. may also be mentioned that theizstay f'bclts 1 edge 68" of: the :ring intottighti substantially-cut- 63 in atheir conve'ntional pa'ssage throug-h the tingziconta'cti-iwith the sloping wall aof the proends 'ofzth'es cup"members and fil' and/or' tuberance 64;: wherewith. the'w'ring ;is;"-:seoured through the pole for stator-pieces of' the motor againstrssubstantially all: manner Lof -radial and ".pass through apertures in the piece i-fifliiand H axial movement :with: respect :to the cup 68; but conventionally with' very considerablyfmore tol v the; ring-sis not necessarily at this'ipointaofi our rancetha-n wedesire tozemployiin -locating the method-1,concentricallyLidisposeclfiwithzrespect to otoraand particularly the axis- 'thei'eof- 'ivith 31167331501? the motor- -It=willvalsobesnoted as Y espect to." th-ezhousing; eThose Lskille'd in the shoWhzifizFigure S that the rin'gfiShasi asdriving arit=willuunderstand ixthat thei 'shafli bearings of notch 11.] cut in :itsrinner'zperiphery $505, that the the 'motorr are:conventionally?fembraced in or same may be-driven 'by.?a' dog or otherwiseton a in associationr-rwith? the protruding more on less lathe after it has been-secured to: the-smotor.

pherical portions oi therbases er the cup's 60 rzThe imotorzw-then havingl thez rin'g '6 secured and BI. theretos as" above described is schucked iinrazilathe Tofacilitate:greater accuracylin mounting and a or=.similartool;? the exposed;end of1 thevsha'ft l1 -valig'ni'ng. themot'or 'werprovide anzannular-ipilot spreferably:beingzheldz fastand the protuberance ring preferably;.madenotbrass ior bronzef hav- 52preferably'ibeingasupportedrin alive'centersconingan external diameterrgreat enough toroverlie centric. I'With" the :axis 10f th'eashaft I'L '2 thestay bolts :63, see-ralsoi' Figure.:i3, zan dzof inupon-th'ea'motor is:rotatedaboutits-own shaft as ternal dia-mete1'-.=:somewhat-lessitharrthev greatest byzvraidrivingrdog engaging thefidrivinga' nomh H; diameter of the-spherical protuberance 641111; The the driving torqueirpreferably"-beingrapplied to ing 65 is counterborediasiatitifi on the rfaoe ithat 1 :5. theiring 5.5: through the notchzsince the next step is to'be juxtaposedato the 'motori,andais pronided in -Fourrmethodirequires;machinin the fa'ce of withr.tappeot rholes 6.! :adapted to receive the th'easringrithatslooksewayfrom the motor To 1 threadedend of the staybolt 63.; Th'eifirst? step :this; endn-azzlathettool .or otherrmetal nemoving of our novel method. of :mountingfiandialigning ltool iisibrought toxbea'r on the' endfa'c'e of the the motorxis toeremo've theicconventional nuts mg fifiwwherewith xto cuti a :true a fiat' annular ;p.--fromthe ends of the stayIbolts-sand re-thread 'radialaface 12' and. an:= intersectin Cylindrical the-rstay-boltsvinto theetapped; holes 61 of the surface i'fizat rightranglesthereto'iof aiparticuring GEL-whereby to draw the: ring 65/;firmly il'arfdiameter which wilLcorrespond approximately -..\-.against the-base end of the cup "60-;whi1st reexactlyiwith the internal-diameteriof the -cylin- -s-drawings the cups into their ultimate rtelescoped dricali surface .14 that has been machined with positions with the. interior of? the'i cupsrtbearing ,desirableaaccuracyfin the partition 6 0i thehous- :axially and firmly on" the -internal structure of ing; the"parti i0n"-6' 0f e us neg als l-iaving 2 the motor,-not2-sh0Wn;1;such as" the;.':ends" of the achinedtthereoniandatright:angles td-the cyliig toenter the depressioni lz vizhil e' the :cover is" "being foi'c'ed irito the "-bayonet i-lock as above entioned wherwitn tcimaintain-astrong:yielding-axial pressure on the central protuberance 52 6f the' -motor in mg the motor downwardly as y We viewed Figure onto and in tighta'zengaga ment- 'with the aline'dearid 'centeredusupp'orting surfaces at the rightwardand"downward end A --'of the motor anwon the partition 6 wherewith to hold the motor securely in its desire'd positioh i o alignment and location' aswillf presently be more fullydescl ibed.

lindrical surface [4 a radial flat annular surface '15 adapted to mate with'and have annular tight mating contact with the surface 12 of the ring. In machining the rin the cutting tool will remove the ends or so much of the ends of the stay bolts 63 as were embodied in the material of the ring that was removed by the turning operations, but since the stay bolts still have fair engagement with the remaining portions of the ring and preferably have lock washers under their heads at the opposite end of the motor casing the function and contribution of the stay bolts to the assembly of the ring and motor parts is retained. Since the cylindrical surface 13 of the ring has been turned about the axis of revolution of the motor about its own shaft it follows that when the motor is mounted in the housing with the cylindrical surface 13 of the ring closely fitting the cylindrical surface 14 of the housing that the axis of the shaft will be concentric with the surface 14 of the housing and since the mating radial surfaces I2 and 75 are respectively truly normal to the axis l1 and to the axis of the housing, the axis of the shaft will be strictly coaxial of the housing when the parts are assembled as shown in Figure 1.

As has been suggested, in the manufacture of the housing the surface i4 is machined to be truly coaxial of the housing and similarly the surface 16 within which the seal 21 is centered is made concentric with the surface 75 with the result that the seal 2| and particularly its inner narrow sealing edge will bear concentrically upon the cylindrical surface of the body 19 of the impeller since the latter must be concentric with the axis of the shaft I! being centered by the close sliding fit between the impeller and the smooth cylindrical portion of the shaft upwardly of the threaded portion thereof. Whilst these controlling surfaces of the partition 6 of the housing are being machined, or in desirable sequence with respect thereto, the other surfaces of the pump chamber and the motor chamber that have to do with the tolerances, clearances and position of the impeller and motor with respect to the housin are machined to desirable location and concentricity. At an appropriate time the surface 23 with respect to which the impeller has running clearance and the surface 80 at the lower end of the housing that locates the lower closure plate 9 are machined to desired axial relationship so that the inner or upper face 8| of the closure plate will have a determinable spacing from the surface 23 which taken with regard to the axial depth of the impeller will afford the desired axial clearances for the radial faces of the impeller when the parts are assembled. In practice we prefer that the impeller clear the face 23 as well as the face 8| by approximately ten to twenty thousandths of an inch and have true parallelism therewith.

To assemble the parts comprisin our motor driven pump unit it is practicable to first insert the seal 2| in the counterbore 25 of the partition 6 and then the motor having the ring 65 attached thereto as above described may be inserted from the upper end of the housing, the shaft passing freely through the seal and central aperture of the partition 6 and the rin 65 being brought into the intimate tight truly centered and aligned contact with the mating surfaces of the partition wherewith to square and center the motor and particularly the axis of its shaft I! with respect to the housing. Thereupon the cover 4 through which the conduit and electrical leads may freely extend in the absence of the locking nut 4| is brought home to the position shown in Figure 1; the yielding pad 5| forcibly constraining the motor to its desired aligned and centered position in the housing with the axis of the shaft concentric of the surface 14 and normal to the surface of the partition and concentric of the seal 21. Thereafter the conduit 5 may be properly located in the aperture 44 and sealed with respect thereto by the nut 41 and washer 42. If during the foregoing operations of assembly the motor has been resting on its bell shaped flange and base l2, as is convenient, it may then be turned upside down wherewith to expose the pump chamber for free access. Then the impeller I 6 may be slid and threaded onto the end of the shaft H, the extreme end of which is preferably notched for receiving the end of a screw driver to hold the shaft against rotation whilst the impeller is turned on the threads and brought to axial alignment by the cylindrical surfaces fitting as at 29 above described until the smooth face of the impeller contacts the true radial surface 23 of the partition. At this point it may be mentioned in passing that the motor is preferably provided with thrust bearings for the armature or rotor shaft which admit of but limited axial play measurably less than the tolerances allowed between the upper and lower faces of the impeller and the surfaces 23 and BI between which the impeller is disposed and has its rotation. The impeller having been threaded onto the shaft to the extent of contacting the surface 23 it is then backed off on the threads only sufficiently to give the desired tolerance between the face of the impeller and the surface 23 whereupon the dome nut 24 is threaded onto the extreme end of the shaft locking the impeller to the shaft in the desired final and intended position. Meanwhile the body of the impeller will have entered the seal 2! and assumed a rotatable sealing relation with respect thereto as shown in Figure 1. Alternatively an ordinary lock nut may be threaded onto the shaft ll whilst the same is held against rotation by a screw driver Wherewith to lock the impeller relative to the shaft while holding the shaft against rotation. Then the dome nut 2d may also be threaded onto the end of the shaft to protect the same from contact with the fluid to be pumped. Preferably the dome nut and/or lock nut and dome nut are made of non-corrosive material as will be the material of the housing, impeller and other parts exposed to the fluid to be pumped. In all events the axial clearance between the upper face of the impeller and the surface 23 of the partition may be readily adjusted with micrometric fineness and with much ease because the vanes of the impeller lend themselves to ready visual observation of the number of degrees of rotation by which the impeller is backed up on the screw ofthe shaft to afford the desired clearance. The operator knowing the pitch of the threads of the screw on the shaft will be able to observe with great accuracy the clearance afforded by backing the impeller on the screw.

After the impeller has been fixed and secured upon the end of the shaft ii the lower closure plate 9 and the screen I I are secured to the lower end of the housing by the screws as shown and the assembly is completed. Preferably the screen II has annular corrugations to afford an extension of the surface thereof and the screen as a whole is preferably curved to a large spherical radius so that the mid-portion of the screen is spaced away frormthe eye of the'impellenand the inlet opening as fully as the depth of the belledlbott'om flange of the housingcomfortably admits tw'ithout causing the "inidep'ortion of. the

screen ,to ldelet'eriously contact-or. approach the surface uponrwhich the pumprestson the bottomiloflth e' bilge or sump where itl'may be use. H

fully disposed for operation.

It goes-without saying that Za propriate-elec-.-,.

trical energyjis afiorded the motor, through the x efficihcy withl regard to the 'desiredhspeed and capacity of the pump.

It is to be noted that the ring-65;;has wide fiat intimate tight bearing areas with both the cup a small. voided areathenein for. a-sufficientlenetht :1 0 saidi conduit th ta-said emoter ca br athe therethroughebut beinggsufficientlm restrictedso: i that :fiamet cannot- {be propagated therethrough.

3. A motor-pump comprisingahousing having an axisjeandpan internals-partition;normalrte said axis; dividin he i t riorsof; said-=housing into: a pump chamberr and: a: motorechamber,ssaid -partitionehavingseacentral gaperturegcoaxiab of i, said axis-a motor imsaid motorchamber said. motor havingran: extern-a casingewith ya partlysrounded end surface and "53, shaf;t; extending through-said e end surface and :-through'-;sai d;aperture, coaxially of saidghousing axisfiian angled seaton, the sl de of said; artition facin csaid:motonchamber"com w pri ing az ylindrical surface?- formedz axiallw of: said housing axis and an adjacent-surface norm-H mal to saideaxis; a'separatetring member having 60 andthe partition 6 as well asthe tight.,,intimate" edge contactwith'the protuberance 64;'a"iid the ring being of high heat conductivity affords a broad free path for heat to flow from the motor to the partition 6 whence its dissipation to the fluid passing through the pum chamber readily takes place.

It may also be noted that we have found it useful especially in and for testing the seal 2i of our pumps to put a teaspoon full or so of soluble oil in the motor chamber of the pump so that the oil will rest on the seal when the pump is in its normal operating position. The soluble oil emulsifies very rapidly whereby to cause discharged water to take on a milk-like color if any of the oil should pass the seal during a testing period.

While we have illustrated and described preferred forms of our invention and improvements, changes and further improvements will occur to those skilled in the art who come to understand the principles hereof without departing from the spirit or substance thereof and we do not care to be limited in the scope and substance of our patent to the forms herein described for the sake of illustration and exemplification.

We claim:

1. A pump-motor unit comprising a housing having intermediate two oppositely facing ends thereof, a transversely extending centrally apertured but otherwise imperforate internal partition dividing the interior of said housing into a pump chamber on one side thereof and a motor chamber on the other side thereof, both of said chambers being within the confines of the housing, a motor in said motor chamber located therein by engagement of said motor with a seat formed on the proximate surface of said partition, said motor having a shaft extending through said aperture, said housing also having a closure cover for said motor chamber remote from said partition, said cover carrying a resilient pad bearing on the end of said motor and forcibly and yieldingly urging it against said partition, and a pump impeller in said pump chamber rigidly secured to and aligned with said shaft.

2. The combination according to claim 1 with electric leads for said motor and fluid tight sealing means between said cover and said housing, said cover having an aperture for said leads, a water-proof conduit for said leads having one end in said cover aperture and a fluid tight seal between said cover aperture and said conduit, said leads filling less than the whole cross-sectional internal area of said conduit and leaving complementary'iseatingi'surfaees formed on one face thereof and seated in the said seat in said partition, said ringalsozhavinga.sharp annular edge sbiting. into. the said rounded end surface of said casing and being located thereon. thereby, means securing said ring to the end of 'said casing with the seating surfaces of said ring respectively coaxial with and normal to the axis of said shaft, and an impeller carried by said shaft in said pump chamber.

4. A motor pump unit comprising a housing having an axis and an internal partition normal to said axis dividing the interior of said housing into a pump chamber and a motor chamber, said partition having a central aperture coaxial of said axis, a motor in said motor chamber, said motor having a casing and a shaft extending through said aperture coaxial of said housing axis, a seat on the side of said partition facing said motor chamber comprising a cylindrical surface formed coaxially of said housing axis, a rigid ring member secured to the exterior of said motor casing adjacent said partition, said member having a fixed complementary cylindrical seating surface formed thereon coaxially of said shaft, said surfaces intimately engaging each other and effecting alignment of the axes of said housing and said shaft, said seat and said ring member each also having mating surfaces disposed in a plane normal to the axis of said housing and said shaft and engaging each other to locate the motor longitudinally in the housing.

5. The unit according to claim 4 in which said member is a one piece element, said motor having stay bolts extending longitudinally through said casing and threadedly engaging said ring member, and screw means also extending through said member into said casing, said bolts and said screw means tightly securing said member in one position on said casing.

6. In combination, a motor pump housing with an apertured transverse partition defining with the interior of said housing a motor chamber, a motor having a sheet metal casing disposed in said chamber, means for securing said motor to said partition including pressure means operatively connected to said housing and said casing and exerting pressure on said casing in a longitudinal direction to urge said casing toward said partition, said motor having a shaft extending through said aperture and being rotatable therein, said casing having surfaces thereon adjacent said partition certain of which are normal to and others coaxial of said shaft, a pump impeller secured to and supported by said shaft on the opposite side of said partition, said partition having surfaces on the side thereof facing said motor certain of which are coaxial with and others normal to the axis of rotation of said shaft, said first named surfaces intimately engaging the last named surfaces to locate the motor and casing within said housing.

7. The combination according to claim 6 in which said pressure means comprises a closure cover detachably connected to said housing remote from said partition and covering said motor chamber, said cover having a yieldable part engaging the end of said casing remote from said partition, the spacing of said yieldable part of said cover from said partition being slightly less than the spacing of said end of the casing from said partition whereby said cover when so connected to said housing forcibly urges said casing against said partition.

HERBERT W. KAATZ. HAROLD F. ENYEART.

REFERENCES CITED The following references are of record in the file of this patent:

Number Number 12 UNITED STATES PATENTS Name Date Lee May 28, 1912 Roemer Mar. 23, 1915 Ponselle July 18, 1933 Kucher Sept. 20, 1938 Kucher May 27, 1941 Waterfill Dec. 16, 1941 Robinson July 28, 1942 Curtis Mar. 2, 1943 Daiger June 29, 1943 Lauer et a1. July 4, 1944 Taylor Feb. 27, 1945 Corey Oct. 16, 1945 Odey July 13, 1948 FOREIGN PATENTS Country Date Denmark Nov. 23, 1942 

